[exsencon]

I installed Suse 11.1 from DVD,no problems

I also tried to install other libusb 0.1.12-110.1(yours)and 0.12-112.1(I think)from a suse repository(rpm) but they wouldn't install because of conflict with the one(s) that is there.I was kind of wary to remove the installed one.

I had a look at the SANE site. The download comes in .tar,I remember having a hard time to get those installed and as you said models 520 and 540 are not listed but close.I don't know yet.

It's really strange.So far as I know Suse is the only one with that libusb problem with that type of scanner.It worked on most distro's I played with(14).